chore: simplify ToWasmTypes traits, general cleanup #629

Job	Run time
Build wasm	2m 38s
Run tests on Linux x86 (nightly)	1m 25s
Run tests on Linux armv7	5m 39s
Run tests on Linux arm64	4m 37s
Run tests on Linux x86 (stable)	1m 4s
Run tests on Linux x86 (stable, no default features)	1m 4s
Run tests on macOS arm64 (Apple M1)	1m 7s
Run tests on Linux x86 (nightly, no default features)	1m 16s
	18m 50s

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